Gyullo

Check this pls: http://www.minecraftforge.net/forum/index.php/topic,9944.0.html

I use the official source, not any 3rd party site ... And everyone is complaining about this bug, this is a way to solved it

Hello, I just check that in Forge profile, the file .json got this line: "minecraftArguments": "${auth_player_name} ${auth_session} --gameDir ${game_directory} --assetsDir ${game_assets} --tweakClass cpw.mods.fml.common.launcher.FMLTweaker", The problem with logging is that you dont give the game the correct parameters. Just correct it as follow: "minecraftArguments": "--username ${auth_player_name} --session ${auth_session} --gameDir ${game_directory} --assetsDir ${game_assets} --tweakClass cpw.mods.fml.common.launcher.FMLTweaker", And then is going to work.